Just as a followup, apparently due to the way grounding is handled on the Dahon/Shimano dynamo hub, I cannot turn the IQ Fly off. Regardless of the switch or which terminals used for the power connection, the light is constantly on. This is not a problem for me, given the estimated 100,000 hour lifespan of the LED, but I thought I would mention it. If anyone with the same setup as mine has figured out a way to turn off the light, I would be interested to hear it.